比如说，汽车制造商想让法院撤销一项加利福尼亚州的州法令，这项州法基于《联邦空气清洁法案》的一些条款，它要求这些汽车厂商降低他们的汽车的二氧化碳的排放。

Carmakers, for example, are trying to get the courts to strike down a Californian state law based on certain provisions of the Clean Air Act that require them to reduce their vehicles' CO2 emissions.

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